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How to remove all nearby green paint from red paint in weight paint mode from a model

I looked and looked online, it's like no one ever solved this question before. So good luck everyone.

I want only the red area, none of that green stuff. So I can have multiple particle hair systems on a model in blender. It's either that or finding some way to have particle hair inside the selected vertices. For some reason, they also like to pop up along the fading lines of the selected vertices. Is there any way to fix this without manually cutting hairs from the model? ( I don't know how to delete hairs one by one, which also would be useful to know.)
Anyone got any helpful ideas? Thank you for your time.

Quick facts:

I want the eyebrow hair along the red on the models face. This is the main concern.

Some of the vertices cross over , for example. The Eye brow and the full body vertex groups. The full body vertex group also contains the eyebrow vertex group. It is there so I can apply the skin pic material to the whole body.

No matter what I do I get 3 outcomes.

Fat eyebrow that goes outside my vertex groups. ( maybe because of the fading lines leading outward from the selected vertices.)

Crazy hair all over the place.

Or nothing.

So manually deleting each strand is an option as well.

I just to have multiple particle hair system of different lengths on my model.

Hey RockinFoxxis, right under weight tools is the clean button. Once you click it (with your current "eyebrows" group selected, as it is in your picture) you will see options where in your first picture is says "weight paint mode". Make sure that "Active Group" is selected, and below it is a slider with a number from 0 to 1. This is the threshold at which a vertex is removed from the group. In this case you can move it to around 0.8 or 0.9 and you should see all the green painted vertices turn blue, and the red remain. Cheers!

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